vaex 获取 hdf5 , vaex.dataframe.DataFrameArrays 索引的

如何解决vaex 获取 hdf5 , vaex.dataframe.DataFrameArrays 索引的

获取Hdf5MemoryMapped文件索引值的方法是什么，还是 vaex DataFrameArrays？

import vaex
import pandas as pd
import numpy as np
data_dec = vaex.open('/home/chinju.salim/DATA_DEC.csv.hdf5')
print(type(data_dec))
data_dec['indices']=data_dec.index

这里我收到错误

ttributeError                            Traceback (most recent call last)
<ipython-input-12-c73234003bd3> in <module>
      4 data_dec = vaex.open('/home/chinju.salim/DATA_DEC.csv.hdf5')
      5 print(type(data_dec))
----> 6 data_dec['indices']=data_dec.index

~/anaconda3/lib/python3.7/site-packages/vaex/dataframe.py in __getattr__(self,name)
    237             return self.__hidden__[name].__get__(self)
    238         else:
--> 239             return object.__getattribute__(self,name)
    240 
    241     @property

AttributeError: 'Hdf5MemoryMapped' object has no attribute 'index'

这对于 DataFrameArrays 也是一样的。

AttributeError: 'DataFrameArrays' object has no attribute 'index'

对于 vaex data frame df - df.index 返回 array 的索引。有没有其他方法可以获取这些类型的索引值？